Is there a particular website or book that is often referenced for identifying gold hallmarks on pocket watch cases? I am usually able to identify most silver hallmarks due to sites like 965-1000 as well as some of the books I have having a small list of silver/gold hallmarks. However, there appears to not be a similar resource for gold hallmarks. Does anyone have any particular suggestions for either websites/books/e-books, etc. that might help identify gold hallmarks?
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